摘要
为对比研究超临界态CO2、液态CO2和气态N2注入采空区的防灭火性能,自主研制了模拟采空区残煤自燃过程实验系统,开展了超临界态CO2、液态CO2和气态N2注入采空区防灭火实验。实验结果表明:12 MPa、39℃超临界态CO2对采空区自燃残煤的降氧降温能力优于6 MPa、30℃液态CO2优于6 MPa、39℃气态N2;12 MPa、39℃超临界态CO2对残煤的降温能力是6 MPa、30℃液态CO2的1.7倍,是6 MPa、39℃气态N2的10倍,对采空区的降温能力是液态CO2的2倍,为气态N2的8倍;12 MPa、39℃超临界CO2对采空区的降氧速率比6 MPa、30℃液态CO2和6 MPa、39℃气态N2高12.5%;12 MPa、39℃超临界CO2的降温能力是8 MPa、39℃超临界CO2的1.7倍,因此适当提高超临界态CO2的注入压力,防灭火性能更佳。
For comparative study the fire-fighting performance of supercritical CO2 and liquid CO2 and gaseous N2 injected into goaf,we have developed an experimental system simulating the spontaneous combustion process of residual coal of goaf independently.The fire-preventing and fire-extinguishing experiments were carried out with supercritical CO2 and liquid CO2 and gaseous N2 injected into goaf.The experimental results show that the oxygen-lowering and cooling performance of supercritical CO2 under 12 MPa,39℃is superior to liquid CO2 under 6 MPa,30℃,and liquid CO2 is superior to gaseous N2 under 6 MPa,39℃on the residual coal of spontaneous combustion in goaf.The cooling capacity of supercritical CO2 under 12 MPa,39℃on residual coal is twice that of liquid CO2 under 6 MPa,30℃,10 times that of gaseous N2 under 6 MPa,39℃and the cooling capacity of supercritical CO2 on air is twice that of liquid CO2 and 8 times that of gaseous N2.The oxygen-lowering rate of supercritical CO2 under 12 MPa,39℃on goaf is 12.5%higher than that of liquid CO2 under 6 MPa,30℃and gaseous N2 under 6 MPa,39℃.The cooling capacity of supercritical CO2 under 12 MPa,39℃is 1.7 times that of supercritical CO2 under 8 MPa,39℃.Therefore,it is better to increase the injection pressure of supercritical CO2 appropriately for the fire-fighting performance.
作者
孙可明
罗国年
冀洪杰
张宇
SUN Keming;LUO Guonian;JI Hongjie;ZHANG Yu(School of Science, Qingdao University of Technology, Qingdao 266520, China;School of mechanics and engineering, Liaoning Technical University, Fuxin 123000, China)
出处
《火灾科学》
CAS
CSCD
北大核心
2019年第4期245-251,共7页
Fire Safety Science
基金
国家自然科学基金面上项目(51574137)
辽宁省教育厅一般项目(LJYL047)。
关键词
超临界CO2
降氧性能
降温性能
液态CO2
气态N2
Supercritical CO2
Oxygen-lowering performance
Cooling performance
Liquid CO2
Gaseous N2
